java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.ansorgit.plugins.bash.lang.psi.impl.arithmetic.AbstractExpression.computeNumericValue(AbstractExpression.java:123)
at com.ansorgit.plugins.bash.editor.inspections.inspections.EvaluateArithmeticExpressionInspection$1.visitArithmeticExpression(EvaluateArithmeticExpressionInspection.java:68)
at com.ansorgit.plugins.bash.lang.psi.impl.arithmetic.AbstractExpression.accept(AbstractExpression.java:56)
at com.intellij.codeInspection.InspectionEngine.acceptElements(InspectionEngine.java:80)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$4.process(LocalInspectionsPass.java:309)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$4.process(LocalInspectionsPass.java:304)
at com.intellij.concurrency.ApplierCompleter.a(ApplierCompleter.java:122)
at com.intellij.concurrency.ApplierCompleter.access$000(ApplierCompleter.java:44)
at com.intellij.concurrency.ApplierCompleter$1.run(ApplierCompleter.java:85)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1098)
at com.intellij.concurrency.ApplierCompleter$2.run(ApplierCompleter.java:94)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:449)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.concurrency.ApplierCompleter.a(ApplierCompleter.java:106)
at jsr166e.CountedCompleter.exec(CountedCompleter.java:684)
at jsr166e.ForkJoinTask.doExec(ForkJoinTask.java:260)
at jsr166e.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:858)
at jsr166e.ForkJoinPool.scan(ForkJoinPool.java:1687)
at jsr166e.ForkJoinPool.runWorker(ForkJoinPool.java:1642)
at jsr166e.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:109)

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